STATEN ISLAND, N.Y. -- Jamie Gonzalez strolls up to the counter of the Subway shop inside Sea View Hospital Rehabilitation Center and Home and orders a sandwich and a bag of chips for his uncle, a patient upstairs.

“It’s a godsend, this place,” Jamie, of Richmond, announces in a booming voice. “Before last week, I had to go out. Now I don’t have to travel outside. I can just come here, get my uncle a sandwich, go right upstairs, and he can eat it.”

When Jamie is told that only two years ago the owner of this godsend sandwich shop lay upstairs on life support with no memory and a severe brain injury from a nasty fall off the roof of his Tottenville home, Jamie smiles, impressed.

“Now that’s a Cinderella story,” Jamie says.

Actually, Boris Shnaydman is a walking miracle story as told by Sea View’s workers, doctors, nurses, anybody who recalls the 49-year-old Staten Island entrepreneur when he was a patient two years ago.

It’s just that Boris has no idea what they are talking about. Or who they are.

Boris owned several Island Subway franchises on Staten Island and was considered an unlikely success story after emigrating from Russia and landing in Brooklyn in 1990 with his wife Rita, his young daughter Inna, $400 in his pocket and a burning desire to catch the American dream.

Then he looked outside on June 16, 2008, and noticed siding hanging off his two-story Tottenville home.

“I was a very handy guy,” Boris recalls. “I was thinking, ‘I can do anything.’ So I went up.”

What happened after that is a blank.

“I don’t remember how I went up, or what I did,” he says, “Or, what knocked me down.”

A “hurricane wind” knocked Boris off the roof. He landed head-first on a concrete slab. His neck was broken.

So was his brain.

“All I know is, I had complete amnesia for one year,” Boris says. “I was in a coma for one month. I went through five surgeries. I had what is called “TBI” — traumatic brain injury. It was internal bleeding.”

Doctors weren’t optimistic. They told Rita that if her husband came out of the coma, they couldn’t guarantee he would have his memory, or normal brain function ever again.

Then he got feeling back on his right side, which was paralyzed. His memory returned, at least all memory before the fall.

Most important: Boris was retaining the present.

“What is it called, hard-headed?” Boris asks, laughing.

“What saved me,” he says pointing to a spot on his forehard, “was that this is the point of impact, the thickest and strongest bone in the human body.”

It helped that Boris was also a picture of fitness.

“I was a tennis player... every day I would play tennis. I was very fit,” Boris says. “This is what saved my life. I was healthy as a horse. That’s why I’m here.”

When Rita received a call late last year that Sea View Hospital was looking to replace the cafeteria with a new food-service establishment, Boris jumped at the opportunity.

He spoke to Sea View’s administrators, then put together a proposal — Subway’s franchise-development presentation — and submitted it to the hospital to be considered along with 15 other companies vying for the space.

Two years after he lay upstairs in a coma with a severe brain injury, Boris was awarded the prime spot downstairs next to the lobby with easy access for hospital visitors — location, location, location.

“We opened a week ago,” Boris says of his sixth and newest Subway now located on the Island.

The business plan says this one won’t be his last.

“I was reading about Donald Trump, and somebody once asked him about the secrets to his success,” Boris says. “And he said, ‘I never stop.’ So I tried to follow his advice, because in this type of business, if you really want to be in this business, you cannot stop.”

Not even when you fall off a roof, land head-first on concrete and wake up not knowing who you are, where you are or what put you there.